Molding machine



Nov. 18, 1930.. A. w. s|zER 1,732,322

MOLDING MACHINE Filed Sept. 3. 1929 2 Sheetg-Sheet 2 /N VE N TOR #Tram/Enf Patented Nov. 18, 1930 UNiTED STATES PATENT fol-FICE ALBERT WILLIAM `SIZER, Aor* IIESSLEQEISIGLAND IVIOI'JJING MACHINE Application filed September 3, 1929f-Se`1ia1 No. 390,163.

A of worm this rapidly became packed with the material fed forward owing to the high pressure at the die plate, and'rotated in the body of the molding machine without feedingl n According to the present Invention, a worm for use in continuous kmolding machines is arranged with a shallow helical grove for .the'major part of its length arranged on lthe body of the feed worm, which body is lof lesser diameter than the internal diameter of the molding chamber, and this shallou7 groove leads at the extreme end into asingle" feed worm'convolution of aldiameter equal tothe. Internal diameter of the chamber,rand .eX-

ftending down to a helical grove of similar diameter than the major length of the feed worinbody having'tlie shallow groove into which it runs. Y

The invention is more scribed with reference drawings in which f Y I Figure lis a perspective view of a suitable particularly `detothe .accomp anying form of feedworm according to the present `invention.V f f f compression chamber 7 This shallow groovek 5 ultimately at the far end of the feed worm body 5 runs into a much deeper groove 8,

which as will be kseen from Figure 2, is ofk diametervroughly. half the diameter of the shallow groove 5. From the main body of the feed worm similarly the thread 9 as distinct from'thegroove 5, runs into a worm or thread convolution 10which is of greater diameter'V than the diameter of the shallow thread 9, and is of substantially the same eX- ternal diameter as the internal diameter of thecompression chamber 7 Pellets are eX- :truded through the diel plate 1l, and are sweptofl' into a chute l l2by means of a rotating knife 13. i

I'declare that what I claim is :j- A continuous molding machine forplastic materialcomprising in combination a compression chamber, a die plate closing said chamber,a feed worm body mounted to rotate withinv said chamber of lesser diameter than said chamber for the major proportion of its length, a shallowV helical flange on said feed worm body' merging at the' delivery end into a flange of diameter equal to the internal diameter of saidgcompression chamber.

Y Inowitness whereof,;I have hereunto signed name this 19th day of August 1929. ALBERT WILLIAM SIZER. Y

Figure 2 is a corresponding sectional elevation.

Figure 3 lis a View of a complete machine, A Y

Meal tov be converted into Vpel-lets ispas'sed froma jacketed chamberv l byfrmean'sA of a' scraper 2 'through a port-gint()v a feed opening 4,w andV in contradistinc tionv to being fed' forward `by the lands lor deep thread, an or- Y,

dinary feed worm is fed forwardby means of an extremelyv shallow groove`5'-in1the body 6 of a feed wormfthis body v6 being for Vthe major-portion of its length of smaller diameter than the vinternal diameter ofA the 

